Magnetism Flashcards
magnets produce
magnetic fields
when placed inside a magnetic field, magnetic materials experience
a force
do non magnetic materials experience a force when put into a magnetic field
NO
magnetism is an example of what type of force ( contact or no contact)
non contact
magnets have a _ and _ pole
South and North
opposite poles
attract
like poles
repel
a magnetic material becomes ___ when in a magnetic field
magnetised
why does a magnetic material become magnetised when placed in a magnetic field
the poles shift so that the mini magnets within the magnet are opposite to the pole of the material, causing it to become magnetised
what happens when a magnetic material is taken out of a magnetic field
it goes back to its unmagnetised state
the force between a magnet and. magnetic material is always attractive or repulsive
attractive
magnetic materials can be __ or __
soft or hard
Magnetically soft materials (2)
are easy to magnetise
don’t remain magnetised for long ( temporarily magnetised)
Magnetically hard materials (2)
are difficult to magnetise
Do not easily lose their magnetism (permanently magnetised)
Permanent magnets are made out of magnetically __ materials
hard
Electromagnets are made out of magnetically ___ materials
soft
what does the fact that electromagnets are made of soft material mean
they can be made magnetic or non-magnetic as an when required
what is an electromagnet
magnet that runs on electricity
what core is used for electromagnets and why
Iron because it is easily magnetised
how do you increase the strength of an electromagnet
- increase current
- increase number of coils
factors that affect the strength of an electromagnet (4)
voltage
current
number of coils
proximity to magnetic field
uses of electromagnets
doorbells
why are soft magnets used for electric bells rather than permanent magnets
if you induce a magnetic material then it would stop ringing as soon as the current stops passing through the wire but with a permanent magnet the ringing would just continue
what is a magnetic field
an area where a magnetic field experiences a force
